In this work, an attempt has been made to study dielectric properties of CaCu3Ti4O12 ceramics. For this, CaCu3Ti4O12 was prepared by a modified solid state reaction method. The dielectric constant (ε') and dielectric loss (tan δ = ε''/ε') were measured within the frequency range from 102 Hz to 106 Hz and the temperature ranging from 30°C to 300°C using HP 4192A LF Impedance Analyzer. The results showed that the dielectric constant and dielectric loss of the sample are frequency... Topics: CaCu3Ti4O12, dielectric constant (ε') dielectric loss (tan δ = ε''/ε')
This study aims to understand thoroughly the effects of calcining and sintering conditions on the relative permittivity and sintering behaviors of the solid solution method of preparing BSTs. BST (BaxSr1-xTiO3, x = 0.6, 0.7,0.8and 0.9) was synthesized using an established solid-state reaction method [R.K. Roeder, E.B. Slamovich, Stoichiometry control and phase selection in hydrothermally derived BaxSr1-xTiO3 powders, J. Am. Ceram. Soc. 82 (7) (1999) 1655, R. Ganesh, E. Goo, Microstructure... Topics: X-Ray Diffraction, Dielectric Constant, Dielectric Loss, Calcining, Sintering
The paper describes a simple and important ferroelectric nature of succinic Acid disodium salt hexa-hydrate. Inthis paper we have studied the variation of dielectric constant with temperature in compressed rectangular pellet formhaving silver paint electrodes using MOTWANE capacity, measuring unit DM-3750B. The plot shows a 2nd order phasetransition at about 700C and a sharp rise of dielectric constant at a very high value 9.4 at 1490C following a phasetransition at this temperature.The lattice... Topics: Dielectric, Ferroelectric, Dielectric Loss, Pyro-Electric, Phase Transition, Hysteresis
This study aims to understand thoroughly the effects of calcining and sintering conditions on the relative permittivity and sintering behaviors of the solid solution method of preparing BSTs. BST (BaSrTiO, x = 0.6, 0.7,0.8 x1-x3and 0.9) was synthesized using an established solid-state reaction method [R.K. Roeder, E.B. Slamovich, Stoichiometry control and phase selection in hydrothermally derived BaSrTiO powders, J. Am. Ceram. Soc. 82 (7) (1999) 1655, R. x1-x3Ganesh, E. Goo, Microstructure and... Topics: X-Ray Diffraction, Dielectric Constant, Dielectric Loss, Calcining, Sintering
The paper describes a simple and important ferroelectric nature of succinic Acid disodium salt hexa-hydrate. In this paper we have studied the variation of dielectric constant with temperature in compressed rectangular pellet formhaving silver paint electrodes using MOTWANE capacity, measuring unit DM-3750B. The plot shows a 2nd order phase transition at about 700C and a sharp rise of dielectric constant at a very high value 9.4 at 1490C following a phase transition at this temperature.The... Topics: Dielectric, Ferroelectric, Dielectric Loss, Pyro-Electric, Phase Transition, Hysteresis
The nanoparticle of barium zirconate titanate (BZT) ceramic was synthesized by solid state reaction method at 1200°C. Single perovskite phase having cubic symmetry is confirmed by X-Ray Diffraction. There are two transition temperatures present around 200K and 330K. The dielectric properties reveal that BZT is a relaxor ferroelectric confirmed by diffusion of two phases (tetragonal and cubic phase). The dielectric constant of BZT ceramics exhibited broad peaks curve near the Tm. This... Topics: XRD, Dielectric Constant, Ferroelectric, Relaxor
Bell System Technical Journal, 20: 1. January 1941 pp 125-128. Abstracts of Technical Articles by Bell System Authors. Topics: frequency, dielectric, modulation, atomic, hysteresis, stability, annealed, neutron, transmission,...
In this work, study of the effect of nanosilver particles on A.C electrical and thermal properties of polymer matrix consisting of polyvinyl alcohol and polyvinyl- pyrrolidone. The samples of (PVA-PVP-Ag) nanocomposites were prepared by using casting method. The weight percentages of nanosilver are (0, 5,10, 15 and 20) wt.%. The experimental results show that the dielectric and thermal properties of (PVA-PVP) are changed with increase of the nanosilver concentrations. Topics: Dielectric Properties, Thermal Properties, Polyvinyl Pyrrolidone, Nanosilver
CaCu3Ti4O12 (CCTO) ceramic was synthesized by the sparkplasma sintering (SPS) technique. The single-phase composition of CCTO was confirmed by X-ray diffraction. The measurements of the dc electrical conduction and dielectric properties show that the dielectric constant, dielectric loss and leakage current density decrease with the thickness decreasing, meanwhile the variation range of the dielectric constant also narrows greatly in the frequency range between 1 kHz and 1 MHz. In... Topics: CaCu3Ti4O12, Ceramics, Spark Plasma Sintering Technique, Dielectric
Bell System Technical Journal, 16: 4. October 1937 pp 574-577. Addendum to "Radio Propagation Over Plane Earth - Field Stength Curves". (Burrows, Charles R.) Topics: equation, oscillations, dielectric, propagation, factor, amplitudes, attenuation, curves,...
Mathematical expression for tensor of dielectric permeability of heterogeneous plasma confined by constant magnetic field Topics: CONFINEMENT, DIELECTRIC PERMEABILITY, HETEROGENEITY, PLASMA CONFINEMENT, TENSOR ANALYSIS,...
byGarcia, J.; Mendoza, C.; Bautista, M. A.; Gorczyca, T. W.; Kallman, T. R.; Palmeri, P
The high spectral resolutions of the Chandra and XMM-Newton X-ray observatories have unveiled the useful diagnostic possibilities of oxygen K absorption. To mention a few, strong O VII and O VIII edges are almost ubiquitous in the spectra of Seyfert 1 galaxies which have been used by Lee et al. (2001) to predict of a warm dust absorber along the line of sight; although this conclusion has been criticized in the light of a data reanalysis (SA0 et al. 2003), Steenbrugge et al. (2003) have... Topics: CERAMICS, PYROELECTRICITY, DIELECTRIC PROPERTIES, INFRARED DETECTORS, HEAT SINKS
In this study, a multi-band FM-CW ground-based scatterometer is used to measure the backscattering coefficient of bare soil surface. Combined with the neural network (NN) and the advanced integrated equation model (AIEM), it inverses all the soil parameters, including dielectric constant, root mean square (RMS) height and correlation length. According to different data sources, the NN can be constituted as different input-output mapping mode. The NN is trained by using theoretical data that are... Topics: Scatterometer, Neural Network, AIEM, Roughness, Dielectric Constant, Soil Moisture
The characteristics of uniform discharge of non-thermal plasma are investigated on the indigenously developed plasma system. The plasma reactor consists of two closely spaced parallel-plated electrodes, driven by an electrical power to generate uniform cold plasma. It was observed that, when the voltage across the electrodes increased beyond breakdownvoltage, uniform discharge was observed. Distance between electrodes, applied voltage, thickness of dielectric barrier, carrier gas and surface... Topics: Non Thermal Plasma, Cold Plasma, Dielectric Barrier, Uniform Discharge
The X-ray fluorescence spectrometer, carried in the SIM bay of the command service module was employed principally for compositional mapping of the lunar surface while in lunar orbit, and secondarily, for X-ray astronomical observations during the trans-earth coast. The lunar surface measurements involved observations of the intensity and characteristics energy distribution of the secondary or fluorescent X-rays produced by the interaction of solar X-rays with the lunar surface. The... Topics: DIELECTRIC PROPERTIES, ELECTRICAL MEASUREMENT, REMOTE SENSORS, AIR, MICROWAVE RADIOMETERS,...
J. W. Tucker & V. W. Rampton Microwave Ultrasonics in Solid State Physics North-Holland Publishing Company 1972 Acrobat 7 Pdf 18.4 Mb. Scanned by artmisa using Canon DR2580C + flatbed option Topics: Electronics, Physics, Piezoelectric, Dielectric, Ferromagnetic, Paramagnetic, Semiconductor,...
THE RESEARCH IS REPORTED CONCERNING THE PROCESSES OF SYNOPTIC SCALE IN THE TROPICAL REGIONS. THE DEVELOPMENT OF A NUMERICAL MODEL OF TROPICAL CIRCULATION TO STUDY THE INTERACTION OF ATMOSPHERIC PROCESSES IS DISCUSSED ALONG WITH THE ANALYSIS OF PROCESSES BY SYNOPTIC METHODS. Topics: MICROELECTRONICS, MICROSTRIP DEVICES, RESONATORS, DIELECTRIC PROPERTIES, ELECTROMAGNETIC FIELDS,...
Dielectric analysis was performed on pristine and azo-dye doped PMMA with different doping levels. The temperature and frequency dependences of dielectric permittivity (ε'), dissipation factor (tan δ) and Ac conductivity(σAC) are studied in the frequency range 100 Hz -100 kHz in temperature range 30-120 oC. It is noticed that the values of ε' decreases with increasing frequency and reach to a nearly constant value at high frequency. On the other hand the dependence of ε' on the temperature... Topics: PMMA, Azo Dye Doping, AC Conductivity, Dielectric Constant
Polypyrrole is a well known conducting polymer whose electrical properties have been studied deeply. Amongst the various ways of polymerizing Pyrrole chemical route was chosen for the present study. Ferric chloride was chosen as an oxidizing agent. Cadmium was found to be an appropriate dopant. Cadmium belongs to group IIB with atomic number 48 having electronic configuration [Kr] 4d10 5s2. An expected substitution of Cd with Nitrogen of Pyrrole would leave a single electron with Cd after bond... Topics: Absorption Coefficient, Extinction Coefficient, Refractive Index, Optical Conductivity, Dielectric...
The electrical properties of the spinel ferrite having general chemical formula NixMg0.5-xCu0.1Zn0.4Fe2O4 (where x= 0.1, 0.2, 0.3, 0.4 & 0.5) have been studied. The samples in the series were prepared by standard double sintering ceramic method. DC resistivity (ρ) measurements were carried out as a function of temperature using simple two-probe method and activation energy (∆E) was determined. It is found that conduction is due to formation of small... Topics: Magnetic Materials, Ceramic Method, Dielectric Properties, Electrical Properties
The Ferroelectric, Dielectric, and Raman studies of Potassium Nitrate (KNO 3): Polyvinylidene fluoride (PVDF) composite films have been studied. The composite film shows the largest value of remanent polarization (P r) in 50 wt. % composition. The ferroelectric phase (phase-III) of potassium nitrate in the composite films shows the nature of ferroelectricity up to room temperature using dielectric measurements. Raman spectroscopy of potassium nitrate (KNO 3) composite films indicates the... Topics: Ferroelectricity, Potassium Nitrate, Dielectric Properties, Ferroelectric Polymers, Composite Films.